Lochinvar SNA285-125 Manuale Utente

1.  Inspect flame through observation window.

2.  If the flame is unsatisfactory at either high fire or low 

fire, turn off water heater and allow water heater to 
cool down. Remove the burner and clean it thoroughly 
using a vacuum cleaner or compressed air. Do not use 
compressed air to clean burner if performed inside a 
building.

3.  Remove the burner, reference FIG. 11-2 below.

4.  When replacing the burner, ensure gasket is in good 

condition and positioned correctly (FIG. 11-2).

1.  At high fire the flame signal shown on the display should 

be at least 10 microamps.

2.  A lower flame signal may indicate a fouled or damaged 

flame sense electrode.  If cleaning the flame sense electrode 
does not improve, ground wiring is in good condition, 
and ground continuity is satisfactory, replace the flame 
sense electrode.

3.  See Section 12 - Troubleshooting for other procedures to 

deal with low flame signal.

1.  Emphasize the need to perform the maintenance schedule 

specified in this manual.

2.  Remind the owner of the need to call a licensed contractor 

should the water heater or system exhibit any unusual 
behavior.

       

Installation & Service Manual

TM

The combustion chamber insulation in 
this appliance contains ceramic fiber 
material. Ceramic fibers can be converted 

 WARNING

to cristobalite in very high temperature applications. The 
International Agency for Research on Cancer (IARC) has 
concluded, “Crystalline silica inhaled in the form of quartz 
or cristobalite from occupational sources is carcinogenic to 
humans (Group 1).” Normal operating temperatures in this 
appliance are below the level to convert ceramic fibers to 
cristobalite. Abnormal operating conditions would have to 
be created to convert the ceramic fibers in this appliance to 
cristobalite.

The ceramic fiber material used in this appliance is an irritant; 
when handling or replacing the ceramic materials it is advisable 
that the installer follow these safety guidelines.



Avoid breathing dust and contact with skin and eyes.   

 
  • Use NIOSH certified dust respirator (N95). This type of 
 

  respirator is based on the OSHA requirements for cristobalite 

   at the time this document was written. Other types of 
    respirators may be needed depending on the job site 
  

conditions. 

Current NIOSH recommendations can be found 

 

  on the NIOSH website at http://www.cdc.gov/niosh/homepage.html. 

   NIOSH approved respirators, manufacturers, and phone 
 

  numbers are also listed on this website.

 

• Wear long-sleeved, loose fitting clothing, gloves, and eye 

  

protection.



Apply enough water to the combustion chamber lining to 

 

prevent airborne dust.

  Remove the combustion chamber lining from the appliance 
 

and place it in a plastic bag for disposal.

 Wash potentially contaminated clothes separately from 
 

other clothing.  Rinse clothes washer thoroughly.

  Eye:  Irrigate immediately.
  Breathing:  Fresh air.

For recommended materials; including brush, appropriate 
extension(s), refractory cover, and detailed instructions see 
Table 11B - Heat Exchanger Cleaning Kits on page 61.

1.  Shut down water heater:

• Follow the “To Turn Off Gas to Appliance” instructions 
  for the water heater in Section 9 - Startup.
• Do not drain the water heater unless it will be exposed 
 to freezing temperatures. If using freeze prevention 
  fluid in system, do not drain.

2.  Allow time for the water heater to cool to room temperature 

if it has been firing.